England salmon numbers hit record low in 2025
If you want one figure to understand the scale of England’s salmon crisis, it is this: according to research from the Environment Agency, Cefas and Natural Resources Wales, 95% of England’s principal salmon rivers were below the level needed to sustain their populations in the 2025 assessment. That is the worst result since records began, and it is up from 88% in the previous year’s assessment. For most readers, principal salmon rivers simply means the main rivers where salmon should be able to survive and reproduce. When so many fall below their safe level, it means too few adult fish are making it back to keep those populations going over time.
If you have ever wondered why people care so much about salmon, the answer starts with the way they live. Atlantic salmon hatch in rivers, head out to sea to grow, and then return to fresh water to spawn. When that cycle works, it tells us a lot has gone right: flows are strong enough, the water is clean enough, and the fish can still reach the places where they lay eggs. When the cycle breaks, it is a warning sign for the wider natural world too. Salmon help connect rivers and seas, they feed other wildlife, and they are one of the clearest indicators that a river is under strain. If salmon are struggling, there is a good chance the river is struggling as well.
The drop in returns shows just how serious the decline has become. Environment Agency figures say that where 15 to 20 young salmon out of every 100 once came back from the sea as adults, now only one or two do. That is not a small slip. It is a collapse in survival. The agencies also make clear that England is not facing this alone. Similar patterns have been seen across the North Atlantic, which suggests that many of the pressures are happening at sea and beyond the control of any one country. That does not let governments off the hook, but it does explain why recovery will need both local river repair and international action.
If you are trying to make sense of what is going wrong inside rivers, the official analysis points to three linked problems: water quantity, water quality and damaged habitat. Water quantity is about whether enough water is actually moving through a river, especially in dry periods. Water quality is about pollution, including sewage, farm run-off and other waste. Damaged habitat covers the physical condition of the river, from blocked migration routes to riverbanks and spawning areas that no longer support fish well. **What this means:** a river can look healthy from a bridge and still fail salmon. If flows are too low, the water can warm up and oxygen levels can drop. If pollution builds up, young fish struggle to survive. If weirs, culverts and other barriers cut off the route upstream, adult salmon may never reach the gravel beds where they need to spawn.
In its reporting to the North Atlantic Salmon Conservation Organisation, the Environment Agency said it has made new commitments to tackle those pressures by 2032. The plan includes restoring 2,282 hectares of peatland and improving water flows below reservoirs so rivers hold up better during dry spells. It also says water companies and other abstractors will be watched more closely to make sure they are not taking more water than rivers can spare. That may sound technical, but it is really about giving rivers a better chance to behave like rivers again. Peatland holds water in the uplands and releases it more slowly. Better reservoir management can prevent sharp changes in flow. Stronger checks on abstraction matter because every extra removal becomes more serious when rivers are already stressed.
The pollution side of the response is just as important. The Environment Agency says it will keep increasing inspections of farms and wastewater treatment works, while also funding more than 800 projects designed to cut pollution from wastewater. If those inspections are firm and the follow-up action is real, that could reduce some of the pressure on salmon at the point where they are most exposed: in the rivers where they hatch and return to breed. The agency has also promised to clear or improve 105 barriers that block salmon from reaching spawning grounds, restore habitat at 252 sites, and plant trees along 648 hectares of riverbank. Those riverbank trees do more than change the view. They help shade the water, keep temperatures lower, reduce erosion and improve conditions for insects and fish alike.
There are already signs that repair work can make a difference. The Environment Agency points to salmon returning to the River Trent and the River Ouse after work to improve water quality and remove migration barriers. In Yorkshire, the Great Yorkshire Rivers Partnership has been reconnecting routes for migratory fish, and the recent return of salmon to parts of the River Don offers a reminder that recovery is still possible. Environment Agency chief executive Philip Duffy called the figures stark, and he is right to do so. **What it means for you as a reader is this:** salmon decline is not an abstract wildlife story. It is a test of whether river policy turns into river repair at the speed now required. The agency said it would publish its next River Basin Management Plans later in 2025, with a stronger push to remove unnecessary weirs and barriers. Salmon can come back, but only if protection, enforcement and habitat repair happen on the scale the crisis now demands.